Rainbow (noun)

1. An arch of colors that forms in the sky when light is refracted and reflected by rain or other water droplets in the air.
2. A symbol of hope and promise often associated with peace and unity.

Origin:

From the old english word regenboga meaning "rainbow".

Examples:

1. After the storm, a beautiful rainbow appeared in the sky.
2. The rainbow was a reminder of the promise made to Noah.
3. The rainbow was a symbol of hope for the future.
4. The children were fascinated by the rainbow.
5. The rainbow was the perfect backdrop for the wedding ceremony.